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"I have a feeling I’m going to be great," comedian jokes of September hosting stint

Sitting behind his piano, the Grammy-, Golden Globe- and Oscar-winner took an operatic route when singing his cheeky new lyrics. "Everyone we know is very white," he began. "We don't have one black friend."

From there, he does everything from simply listing things they do on the show to making fun of the characters. "Grandmama is always such a witch/She needs to get laid," he sings as the camera pans to a portrait of Maggie Smith as Violet Crawley.

Legend has had fun with television theme songs before. Earlier this year, he slowed down the theme song for reality series Vanderpump Rulesfor his wife Chrissy Teigen's friend.

Earlier this week, Jimmy Kimmel was tapped as the host for this year's Emmy Awards. He had previously hosted the show in 2012.